U.S. patent number 11,374,687 [Application Number 16/598,912] was granted by the patent office on 2022-06-28 for data sending method, data receiving method, and related device.
This patent grant is currently assigned to HUAWEI TECHNOLOGIES CO., LTD.. The grantee listed for this patent is HUAWEI TECHNOLOGIES CO., LTD.. Invention is credited to Bo Fan, Peng Guan.
United States Patent |
11,374,687 |
Guan , et al. |
June 28, 2022 |
Data sending method, data receiving method, and related device
Abstract
This application discloses a data sending method, a data
receiving method, and an apparatus. The data sending method
includes: if first type data is punctured, preserving, by a network
device, a punctured first data subset in the first type data and
puncture location information of the first data subset in the first
type data, and retransmitting the first data subset within a second
scheduling period to a user equipment. In this way, the network
device does not need to wait for feedback from the user equipment
before the network device can perform a retransmission operation,
so that latency of retransmission is reduced. In addition, the
network device only needs to retransmit the punctured first data
subset within the second scheduling period but does not need to
retransmit the entire first type data, so that an amount of data to
be retransmitted is reduced and fewer transmission resources are
consumed.
Inventors: |
Guan; Peng (Chengdu,
CN), Fan; Bo (Chengdu, CN) |
Applicant: |
Name |
City |
State |
Country |
Type |
HUAWEI TECHNOLOGIES CO., LTD. |
Guangdong |
N/A |
CN |
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Assignee: |
HUAWEI TECHNOLOGIES CO., LTD.
(Guangdong, CN)
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Family
ID: |
1000006398733 |
Appl.
No.: |
16/598,912 |
Filed: |
October 10, 2019 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20200044776 A1 |
Feb 6, 2020 |
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Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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PCT/CN2018/080503 |
Mar 26, 2018 |
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Foreign Application Priority Data
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Apr 12, 2017 [CN] |
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201710237464.8 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04L
1/0069 (20130101); H04L 27/265 (20130101); H04W
80/02 (20130101); H04L 1/0061 (20130101); H04W
72/042 (20130101); H04W 72/0466 (20130101) |
Current International
Class: |
H04L
1/00 (20060101); H04W 72/04 (20090101); H04W
80/02 (20090101); H04L 27/26 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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105979597 |
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Sep 2016 |
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CN |
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106413105 |
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Feb 2017 |
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CN |
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107295682 |
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Oct 2017 |
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CN |
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2017056003 |
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Apr 2017 |
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WO |
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Other References
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URLLC in DL",TSG-RAN WG1 NR Ad-hoc Meeting,R1-1700972,Spokane, USA,
Jan. 16-20, 2017, total 23 pages. cited by applicant .
Ericsson,"eMBB/URLLC Multiplexing Solutions for Downlink",3GPP
TSG-RAN WG1 Meeting #88-bis,R1-1706055, Spokane, US, Apr. 3-7,
2017, total 3 pages. cited by applicant .
Ericsson: "eMBB/URLLC Multiplexing Solutions for Downlink",3GPP
Draft; R1-1706055,Apr. 2, 2017,total 3 pages. cited by applicant
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Nokia et al: "Punctured Scheduling for Low Latency Transmissions",
3GPP Draft; R1-1609747,Oct. 9, 2016,total 5 pages. cited by
applicant .
Spreadtrum Communications: "On DL eMBB and URLLC multiplexing
transmissions",3GPP Draft; R1-1705158,Apr. 2, 2017,total 7 pages.
cited by applicant .
Ericsson: "Performance Evaluation of DL eMBB/URLLC
Multiplexing",3GPP Draft; R1-1706054,Apr. 2, 2017,total 5 pages.
cited by applicant .
3GPP TS 36.211 V12.4.0 (Dec. 2014), 3rd Generation Partnership
Project; Technical Specification Group Radio Access Network;
Evolved Universal Terrestrial Radio Access (E-UTRA); Physical
channels and modulation(Release 12), 124 pages. cited by applicant
.
3GPP TS 36.212 V13.0.0 (Dec. 2015), 3rd Generation Partnership
Project; Technical Specification Group Radio Access Network;
Evolved Universal Terrestrial Radio Access (E-UTRA); Multiplexing
and channel coding(Release 13), 121 pages. cited by applicant .
3GPP TS 36.213 V13.0.0 (Dec. 2015), 3rd Generation Partnership
Project; Technical Specification Group Radio Access Network;
Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer
procedures(Release 13), 326 pages. cited by applicant .
Qualcomm Incorporated, Outer erasure code use cases and evaluation
assumptions. 3GPP TSG-RAN WG1 #85 May 23-27, 2016, Nanjing, China,
R1-164703, 6 pages. cited by applicant.
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Primary Examiner: Vu; Hoang-Chuong Q
Attorney, Agent or Firm: Womble Bond Dickinson (US) LLP
Parent Case Text
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of International Application No.
PCT/CN2018/080503, filed on Mar. 26, 2018, which claims priority to
Chinese Patent Application No. 201710237464.8, filed on Apr. 12,
2017. The disclosures of the aforementioned applications are hereby
incorporated by reference in their entireties.
Claims
What is claimed is:
1. A data sending method, comprising: within a first scheduling
period, if a first type data is punctured by a second type data,
preserving a first data subset of the first type data preempted by
the second type data, and puncture location information of the
first data subset in the first type data, wherein the puncture
location information indicates a conversion rule of the first data
subset in a time-frequency resource block corresponding to a second
scheduling period, wherein the conversion rule indicates a
correspondence between a first mapping pattern and a second mapping
pattern of the first data subset in the time-frequency resource
block corresponding to the second scheduling period; and within the
second scheduling period, transmitting the first data subset, the
puncture location information, and puncture indication information,
wherein the puncture indication information is used to indicate
that the first data subset is retransmitted data triggered by
puncturing.
2. The method according to claim 1, wherein the first data subset
and the first type data are scrambled sequences obtained after
scrambling processing.
3. The method according to claim 1, wherein the puncture location
information comprises starting location information of the first
data subset in the first type data and length information of the
first data subset.
4. The method according to claim 1, wherein the puncture location
information indicates the first mapping pattern of the first data
subset in a time-frequency resource block corresponding to the
first scheduling period.
5. A data receiving method, comprising: receiving and preserving a
second data subset of a first type data within a first scheduling
period; receiving a first data subset of the first type data,
puncture location information, and puncture indication information
within a second scheduling period, wherein the puncture indication
information is used to indicate that the first data subset is
retransmitted data triggered by puncturing of the first type data,
and wherein the puncture location information indicates a location
of the first data subset in the first type data, wherein the
puncture location information indicates a conversion rule of the
first data subset in a time-frequency resource block corresponding
to the second scheduling period, wherein the conversion rule
indicates a correspondence between a first mapping pattern and a
second mapping pattern of the first data subset in the
time-frequency resource block corresponding to the second
scheduling period; and combining the first data subset and the
second data subset based on the puncture location information to
obtain the first type data.
6. The method according to claim 5, wherein the first data subset,
the second data subset, and the first type data are scrambled
sequences obtained after demodulation processing.
7. The method according to claim 5, wherein the first data subset,
the second data subset, and the first type data are modulated
symbol sequences obtained after fast Fourier transform (FFT)
processing.
8. The method according to claim 5, wherein the puncture location
information comprises starting location information of the first
data subset in the first type data and length information of the
first data subset.
9. The method according to claim 5, wherein the puncture location
information indicates the first mapping pattern of the first data
subset in a time-frequency resource block corresponding to the
first scheduling period.
10. The method according to claim 5, wherein combining the first
data subset and the second data subset based on the puncture
location information to obtain the first type data further
comprises: performing descrambling processing on the first type
data to obtain a redundancy version sequence; performing rate
de-matching on the redundancy version sequence to obtain a channel
coding sequence; performing channel decoding processing on the
channel coding sequence to obtain a check bit sequence, wherein the
check bit sequence includes an information bit sequence and a
cyclic redundancy check (CRC) code; and determining, based on the
CRC code in the check bit sequence, whether the information bit
sequence in the check bit sequence is correct.
11. The method according to claim 5, wherein combining the first
data subset and the second data subset based on the puncture
location information to obtain the first type data further
comprises: performing demodulation processing on the first type
data to obtain a modulated symbol sequence; performing descrambling
processing on the modulated symbol sequence to obtain a redundancy
version sequence; performing rate de-matching on the redundancy
version sequence to obtain a channel coding sequence; performing
channel decoding processing on the channel coding sequence to
obtain a check bit sequence, wherein the check bit sequence
includes an information bit sequence and a cyclic redundancy check
(CRC) code; and performing CRC processing on the information bit
sequence based on the CRC code in the check bit sequence.
12. The method according to claim 5, wherein the puncture location
information is received by using downlink control information (DCI)
on a physical downlink control channel (PDCCH) or through a
physical downlink shared channel, and wherein the puncture
indication information is received by using the DCI or a media
access control control element (MAC-CE) on the PDCCH.
13. A terminal, comprising: a transceiver configured to receive a
second data subset of a first type data within a first scheduling
period, and to receive a first data subset of the first type data,
puncture location information, and puncture indication information
within a second scheduling period, wherein the puncture indication
information is used to indicate that the first data subset is
retransmitted data triggered by puncturing of the first type data,
and wherein the puncture location information indicates a location
of the first data subset in the first type data, wherein the
puncture location information indicates a conversion rule of the
first data subset in a time-frequency resource block corresponding
to the second scheduling period, wherein the conversion rule
indicates a correspondence between a first mapping pattern and a
second mapping pattern of the first data subset in the
time-frequency resource block corresponding to the second
scheduling period; a memory configured to preserve the second data
subset within the first scheduling period; and a processor
configured to combine the first data subset and the second data
subset based on the puncture location information to obtain the
first type data.
14. The terminal according to claim 13, wherein the processor is
further configured to demodulate the first data subset and the
second data subset of the first type data to obtain scrambled
sequences.
15. The terminal according to claim 13, wherein the processor is
further configured to perform fast Fourier transform (FFT)
processing on the first data subset and the second data subset of
the first type data to obtain modulated symbol sequences.
16. The terminal according to claim 13, wherein the puncture
location information indicates a starting location of the first
data subset in the first type data and a length of the first data
subset.
17. The terminal according to claim 13, wherein the puncture
location information indicates the first mapping pattern of the
first data subset in a time-frequency resource block corresponding
to the first scheduling period.
18. The terminal according to claim 13, wherein the processor is
further configured to: perform descrambling processing on the first
type data to obtain a redundancy version sequence; perform rate
de-matching on the redundancy version sequence to obtain a channel
coding sequence; perform channel decoding processing on the channel
coding sequence to obtain a check bit sequence, wherein the check
bit sequence includes an information bit sequence and a cyclic
redundancy check (CRC) code; and determine, based on the CRC code
in the check bit sequence, whether the information bit sequence in
the check bit sequence is correct.
19. The terminal according to claim 13, wherein the processor is
further configured to: perform demodulation processing on the first
type data to obtain a modulated symbol sequence; perform
descrambling processing on the modulated symbol sequence to obtain
a redundancy version sequence; perform rate de-matching on the
redundancy version sequence to obtain a channel coding sequence;
perform channel decoding processing on the channel coding sequence
to obtain a check bit sequence, wherein the check bit sequence
includes an information bit sequence and a cyclic redundancy check
(CRC) code; and perform CRC processing on the information bit
sequence based on the CRC code in the check bit sequence.
20. The terminal according to claim 13, wherein the puncture
location information is received by using downlink control
information (DCI) on a physical downlink control channel (PDCCH) or
through a physical downlink shared channel (PDSCH), and wherein the
puncture indication information is received by using the DCI or a
media access control control element (MAC-CE) on the PDCCH.
Description
TECHNICAL FIELD
The present invention relates to the communications field, and in
particular, to a data sending method, a data receiving method, and
a related device.
BACKGROUND
In an application scenario of a 5G new air interface, data of
various service types may be transmitted in parallel. For example,
eMBB (enhanced Mobile Broadband) data and URLLC (Ultra-Reliable and
Low Latency Communication) data may be transmitted within a same
scheduling period. URLLC data has characteristics of low latency
and high reliability and therefore usually has a relatively high
priority. In a process in which a base station is to send eMBB
data, if new URLLC data arrives, the base station punctures
time-frequency resources of the eMBB data and allocates, to the
received URLLC data, time-frequency resources that originally
belong to the eMBB data. FIG. 1a is a schematic diagram of
time-frequency resources allocated to eMBB data in a slot n, and
FIG. 1b is a schematic diagram showing that URLLC data punctures
time-frequency resources of the eMBB data in the slot n. Because
the time-frequency resources of the eMBB data are punctured by the
URLLC data, the eMBB data sent by the base station in the slot n
becomes incomplete. The base station needs to retransmit the eMBB
data to ensure that user equipment receives the correct eMBB data.
How to retransmit eMBB data is an urgent problem that needs to be
resolved at present.
SUMMARY
A technical problem to be resolved by embodiments of the present
invention is to provide a data sending method, a data receiving
method, and a related device, to resolve a problem of
retransmitting punctured data.
According to a first aspect, this application provides a data
sending method, including: within a first scheduling period, first
type data of a network device is punctured by second type data. The
network device may be a base station. The first type data and the
second type data are data of two different service types. A
priority of the second type data is higher than that of the first
type data. For example, the first type data is eMBB data, and the
second type data is URLLC data. Puncturing indicates that
time-frequency resources of the first type data are preempted by
the second type data. The network device determines a first data
subset, punctured by the second type data, in the first type data
and determines puncture location information of the first data
subset in the first type data. Data that is not punctured by the
second type data and that is in the first type data is a second
data subset. The first data subset and the second data subset
constitute the first type data. Within the first scheduling period,
the network device transmits the second data subset and the second
type data. Within a second scheduling period, the network device
transmits the first data subset, the puncture location information,
and puncture indication information. The puncture indication
information indicates that the first data subset transmitted by the
second scheduling period is retransmitted data triggered by
puncturing.
It should be noted that the network device sets a same HARQ process
number for the first scheduling period and the second scheduling
period, indicating that both the first scheduling period and the
second scheduling period are used to transmit the first type data.
The HARQ process number may be carried in DCI. In an embodiment of
implementing the first aspect, if the first type data is punctured,
the network device preserves the punctured first data subset in the
first type data and the puncture location information of the first
data subset by user equipment in the first type data, and
retransmits the first data subset within the second scheduling
period. In this way, the network device does not need to wait for
feedback from the user equipment before the network device can
perform a retransmission operation, so that latency of
retransmission is reduced. In addition, the network device only
needs to retransmit the punctured first data subset within the
second scheduling period but does not need to retransmit the entire
first type data, so that an amount of data to be retransmitted is
reduced and fewer transmission resources are consumed.
In a possible implementation of the first aspect, the first data
subset, the second data subset, and the first type data are
scrambled sequences obtained after scrambling processing. The first
data subset is one or more continuous bit sequences in the first
type data.
In one embodiment of the first aspect, the first data subset and
the first type data are modulated symbol sequences obtained after
modulation processing.
In one embodiment of the first aspect, the puncture location
information indicates a starting location of the first data subset
in the first type data and a length of the first data subset. If
the first data subset is one continuous bit sequence in the first
type data, the puncture location information includes a sequence
number of the first bit of the bit sequence in the first type data
and a length of the bit sequence. If the first data subset is a
plurality of continuous bit sequences in the first type data, the
puncture location information includes a sequence number of the
first bit of each bit sequence in the first type data and a length
of each bit sequence.
In one embodiment of the first aspect, the puncture location
information indicates:
a first mapping pattern of the first data subset in a
time-frequency resource block corresponding to the first scheduling
period; or
a conversion rule of the first data subset in a time-frequency
resource block corresponding to the second scheduling period, where
the conversion rule indicates a correspondence between a first
mapping pattern and a second mapping pattern of the first data
subset in the time-frequency resource block corresponding to the
second scheduling period.
In one embodiment of the first aspect, the transmitting the first
data subset includes:
calculating a cyclic redundancy check CRC code of the first data
subset according to a CRC (Cyclic Redundancy Check) algorithm;
adding the CRC code after the first data subset to generate a check
bit sequence;
performing segmentation processing on the check bit sequence to
obtain a plurality of code blocks;
adding a CRC code to each code block;
performing channel coding processing on the code blocks to which
the CRC codes are added to obtain a channel coding sequence;
performing rate matching on the channel coding sequence to obtain a
redundancy version sequence;
performing scrambling processing on the redundancy version sequence
to obtain a scrambled sequence;
performing modulation processing on the scrambled sequence to
obtain a modulated symbol sequence;
performing resource mapping and IFFT (Inverse Fast Fourier
Transform) processing on the modulated symbol sequence to obtain an
OFDM (Orthogonal Frequency Division Multiplexing) symbol;
performing up-conversion processing on the OFDM symbol to obtain a
radio frequency signal; and
sending the radio frequency signal to the user equipment.
In one embodiment of the first aspect, the transmitting the first
data subset includes:
performing resource mapping and IFFT processing on the first data
subset to obtain an OFDM symbol;
performing up-conversion processing on the OFDM symbol to obtain a
radio frequency signal; and
sending the radio frequency signal to the user equipment.
In one embodiment of the first aspect, the puncture location
information is transmitted to the user equipment by using downlink
control information (DCI) on a physical downlink control channel or
through a physical downlink shared channel.
In one embodiment of the first aspect, the puncture indication
information is sent to the user equipment by using DCI or a MAC-CE
(media access control control element) on a physical downlink
control channel.
According to a second aspect, this application provides an eMBB
data receiving method. First, user equipment receives a second data
subset within a first scheduling period and preserves the second
data subset. The user equipment receives a first data subset,
location information, and puncture indication information within a
second scheduling period. Puncture location information indicates a
location of the first data subset in first type data. The puncture
indication information indicates that the first data subset is
retransmitted data triggered by puncturing. The user equipment
further receives second type data within the first scheduling
period. The second type data is data that punctures a
time-frequency resource block of the first type data. The first
type data and the second type data are data of different service
types. A priority of the second type data is higher than that of
the first type data. For example, the first type data is eMBB data,
and the second type data is URLLC data. When receiving the puncture
indication information within the second scheduling period, the
user equipment determines that the first data subset is
retransmitted data triggered by puncturing. When scheduling data
transmission once, a network device sets a same HARQ process number
for all scheduling periods. The user equipment may obtain a current
HARQ process number based on a DCI received within the second
scheduling period, then determine, in the former scheduling period,
the first scheduling period having the same current HARQ process
number, obtain the second data subset preserved within the first
scheduling period, and combine the first data subset and the second
data subset based on the puncture location information to obtain
original data. In an embodiment of implementing the second aspect,
the user equipment preserves the second data subset when receiving
the second data subset within the first scheduling period. The user
equipment receives the first data subset within the second
scheduling period, and determines, based on the puncture indication
information, that the first data subset is retransmitted data
triggered by puncturing. The user equipment combines the first data
subset and the second data subset based on the location information
to obtain the complete first type data. The network device does not
need to wait for feedback from the user equipment before the
network device can retransmit data to the user equipment, so that
latency of retransmission is reduced. In addition, retransmitted
data received by the user equipment is the first data subset that
is a part of the first type data, and it is not necessary to
receive the entire first type data, so that an amount of
retransmitted data that is to be received is reduced.
In one embodiment of the second aspect, the first data subset, the
second data subset, and the first type data are scrambled sequences
obtained after demodulation processing.
In one embodiment of the second aspect, the first data subset, the
second data subset, and the first type data are modulated symbol
sequences obtained after fast Fourier transform FFT processing.
In one embodiment of the second aspect, the puncture location
information indicates a starting location of the first data subset
in the first type data and a length of the first data subset.
In one embodiment of the second aspect, the puncture location
information indicates:
a first mapping pattern of the first data subset in a
time-frequency resource block corresponding to the first scheduling
period; or
a second mapping pattern and a conversion rule of the first data
subset in a time-frequency resource block corresponding to the
second scheduling period, where the conversion rule indicates a
correspondence between a first mapping pattern and the second
mapping pattern.
In one embodiment of the second aspect, the receiving a first data
subset includes:
receiving an OFDM symbol;
performing FFT processing on the OFDM symbol to obtain a modulated
symbol sequence;
performing demodulation processing on the modulated symbol sequence
to obtain a scrambled sequence;
performing descrambling processing on the scrambled sequence to
obtain a first redundancy version sequence;
performing rate de-matching processing on the first redundancy
version sequence to obtain a first channel coding sequence;
performing channel decoding processing on the first channel coding
sequence to obtain a first check bit sequence; and
removing a CRC code in the first check bit sequence to obtain the
first data subset.
In one embodiment of the second aspect, the method further
includes:
performing descrambling processing on the first type data to obtain
a second redundancy version sequence;
performing rate de-matching on the second redundancy version
sequence to obtain a second channel coding sequence;
performing channel decoding processing on the second channel coding
sequence to obtain a second check bit sequence; and
determining, based on a CRC code in the second check bit sequence,
whether an information bit sequence in the check bit sequence is
correct.
In one embodiment of the second aspect, the method further
includes:
performing demodulation processing on the first type data to obtain
a modulated symbol sequence;
performing descrambling processing on the modulated symbol sequence
to obtain a redundancy version sequence;
performing rate de-matching on the redundancy version sequence to
obtain a channel coding sequence;
performing channel decoding processing on the channel coding
sequence to obtain a check bit sequence; and
performing CRC processing based on a CRC code in the check bit
sequence.
In one embodiment of the second aspect, the puncture location
information is received by using downlink control information DCI
on a physical downlink control channel or through a physical
downlink shared channel.
In one embodiment of the second aspect, the puncture indication
information is received by using DCI or a MAC-CE on a physical
downlink control channel.
According to a third aspect, this application provides a data
sending apparatus, including:
a preservation unit, configured to: within a first scheduling
period, if first type data is punctured by second type data,
preserve a first data subset, preempted by the second type data, in
the first type data and puncture location information of the first
data subset in the first type data; and
a transmission unit, configured to transmit the first data subset,
the puncture location information, and puncture indication
information within a second scheduling period, where the puncture
indication information is used to indicate that the first data
subset is retransmitted data triggered by puncturing.
In one embodiment of the third aspect, the transmission unit is
configured to:
calculate a cyclic redundancy check CRC code of the first data
subset according to a CRC algorithm;
add the CRC code after the first data subset to generate a check
bit sequence;
perform segmentation processing on the check bit sequence to obtain
code blocks;
add a corresponding CRC code to each code block;
perform channel coding processing on the code blocks to which the
CRC codes are added to obtain a channel coding sequence;
perform rate matching on the channel coding sequence to obtain a
redundancy version sequence;
perform scrambling processing on the redundancy version sequence to
obtain a scrambled sequence;
perform modulation processing on the scrambled sequence to obtain a
modulated symbol sequence;
perform resource mapping and IFFT processing on the modulated
symbol sequence to obtain an OFDM symbol;
perform up-conversion processing on the OFDM symbol to obtain a
radio frequency signal; and
send the radio frequency signal to user equipment.
In one embodiment of the third aspect, the transmission unit is
configured to:
perform resource mapping and IFFT processing on the first data
subset to obtain an OFDM symbol;
perform up-conversion processing on the OFDM symbol to obtain a
radio frequency signal; and
send the radio frequency signal to the user equipment.
According to a fourth aspect, this application provides an
apparatus, including a processor and a memory, where the memory
stores instructions, and when the apparatus is run, the processor
is enabled to perform the following operations:
within a first scheduling period, if first type data is punctured
by second type data, instructing the memory to preserve a first
data subset, preempted by the second type data, in the first type
data and puncture location information of the first data subset in
the first type data; and
outputting the first data subset, the puncture location
information, and puncture indication information, where the
puncture indication information is used to indicate that the first
data subset is retransmitted data triggered by puncturing.
In one embodiment of the fourth aspect, the processor is further
configured to:
calculate a cyclic redundancy check CRC code of the first data
subset according to a CRC algorithm;
add the CRC code after the first data subset to generate a check
bit sequence;
perform segmentation processing on the check bit sequence to obtain
code blocks;
add a corresponding CRC code to each code block;
perform channel coding processing on the code blocks to which the
CRC codes are added to obtain a channel coding sequence;
perform rate matching on the channel coding sequence to obtain a
redundancy version sequence;
perform scrambling processing on the redundancy version sequence to
obtain a scrambled sequence;
perform modulation processing on the scrambled sequence to obtain a
modulated symbol sequence;
perform resource mapping and IFFT processing on the modulated
symbol sequence to obtain an OFDM symbol;
perform up-conversion processing on the OFDM symbol to obtain a
radio frequency signal; and
output the radio frequency signal.
In one embodiment of the fourth aspect, the processor is further
configured to:
perform resource mapping and IFFT processing on the first data
subset to obtain an OFDM symbol;
perform up-conversion processing on the OFDM symbol to obtain a
radio frequency signal; and
output the radio frequency signal.
According to a fifth aspect, this application discloses a data
receiving apparatus, including:
a preservation unit, configured to receive and preserve a second
data subset within a first scheduling period;
a receiving unit, configured to receive a first data subset,
puncture location information, and puncture indication information
within a second scheduling period, where the puncture indication
information is used to indicate that the first data subset is
retransmitted data triggered by puncturing, and the puncture
location information indicates a location of the first data subset
in first type data; and
a combination unit, configured to combine the first data subset and
the second data subset based on the puncture location information
to obtain the first type data.
In one embodiment of the fifth aspect, the receiving unit is
configured to:
receive an OFDM symbol;
perform FFT processing on the OFDM symbol to obtain a modulated
symbol sequence;
perform demodulation processing on the modulated symbol sequence to
obtain a scrambled sequence;
perform descrambling processing on the scrambled sequence to obtain
a first redundancy version sequence;
perform rate de-matching processing on the first redundancy version
sequence to obtain a first channel coding sequence;
perform channel decoding processing on the first channel coding
sequence to obtain a first check bit sequence; and
remove a CRC code in the first check bit sequence to obtain the
first data subset.
In one embodiment of the fifth aspect, the apparatus further
includes:
a descrambling unit, configured to perform descrambling processing
on the first type data to obtain a second redundancy version
sequence;
a rate de-matching unit, configured to perform rate de-matching on
the second redundancy version sequence to obtain a second channel
coding sequence;
a decoding unit, configured to perform channel decoding processing
on the second channel coding sequence to obtain a second check bit
sequence; and
a CRC unit, configured to determine, based on a CRC code in the
second check bit sequence, whether an information bit sequence in
the check bit sequence is correct.
In one embodiment of the fifth aspect, the apparatus further
includes:
a demodulation unit, configured to perform demodulation processing
on the first type data to obtain a modulated symbol sequence;
a descrambling unit, configured to perform descrambling processing
on the modulated symbol sequence to obtain a redundancy version
sequence;
a rate de-matching unit, configured to perform rate de-matching on
the redundancy version sequence to obtain a channel coding
sequence;
a decoding unit, configured to perform channel decoding processing
on the channel coding sequence to obtain a check bit sequence;
and
a CRC unit, configured to perform CRC processing based on a CRC
code in the check bit sequence.
According to a sixth aspect, this application discloses an
apparatus, including a processor and a memory, where the memory
stores instructions, and when the apparatus is run, the processor
is enabled to perform the following operations:
receiving a second data subset within a first scheduling
period;
receiving a first data subset, puncture location information, and
puncture indication information within a second scheduling period,
where the puncture indication information is used to indicate that
the first data subset is retransmitted data triggered by
puncturing, and the puncture location information indicates a
location of the first data subset in first type data;
combining the first data subset and the second data subset based on
the puncture location information to obtain the first type data;
and
the memory is configured to preserve the second data subset within
the first scheduling period.
In one embodiment of the sixth aspect,
the processor is further configured to perform FFT processing on an
OFDM symbol to obtain a modulated symbol sequence;
perform demodulation processing on the modulated symbol sequence to
obtain a scrambled sequence;
perform descrambling processing on the scrambled sequence to obtain
a first redundancy version sequence;
perform rate de-matching processing on the first redundancy version
sequence to obtain a first channel coding sequence;
perform channel decoding processing on the first channel coding
sequence to obtain a first check bit sequence; and
remove a CRC code in the first check bit sequence to obtain the
first data subset.
In one embodiment of the sixth aspect, the processor is further
configured to:
perform descrambling processing on the first type data to obtain a
second redundancy version sequence;
perform rate de-matching on the second redundancy version sequence
to obtain a second channel coding sequence;
perform channel decoding processing on the second channel coding
sequence to obtain a second check bit sequence; and
determine, based on a CRC code in the second check bit sequence,
whether an information bit sequence in the check bit sequence is
correct.
In one embodiment of the sixth aspect, the processor is further
configured to:
perform demodulation processing on the first type data to obtain a
modulated symbol sequence;
perform descrambling processing on the modulated symbol sequence to
obtain a redundancy version sequence;
perform rate de-matching on the redundancy version sequence to
obtain a channel coding sequence;
perform channel decoding processing on the channel coding sequence
to obtain a check bit sequence; and
perform CRC processing based on a CRC code in the check bit
sequence.
According to a seventh aspect, this application discloses a
computer-readable storage medium, including instructions, where
when being run on a computer, the instructions enable the computer
to perform the data sending method in the first aspect.
According to an eighth aspect, this application discloses a
computer-readable storage medium, including instructions, where
when being run on a computer, the instructions enable the computer
to perform the data receiving method in the second aspect.
DESCRIPTION OF DRAWINGS
To describe the user equipment and technical solutions in the
embodiments of the present invention or in the background more
clearly, the following briefly describes the accompanying drawings
required for describing the embodiments of the present invention or
the background.
FIG. 1a shows a mapping pattern of a control channel and eMBB data
on a time-frequency resource block of a slot n;
FIG. 1b is a diagram showing that URLLC data punctures
time-frequency resources of eMBB data;
FIG. 2a is a network architecture diagram of a communications
system according to an embodiment of the present invention;
FIG. 2b is a processing flowchart of data on physical layers of a
base station and user equipment according to an embodiment of the
present invention;
FIG. 3 is a flowchart of a data sending method according to an
embodiment of the present invention;
FIG. 4 is a flowchart of a data receiving method according to an
embodiment of the present invention;
FIG. 5 is another flowchart of a data sending method according to
an embodiment of the present invention;
FIG. 6 is another flowchart of a data receiving method according to
an embodiment of the present invention;
FIG. 7a is a diagram of data puncturing according to an embodiment
of the present invention;
FIG. 7b is another diagram of data puncturing according to an
embodiment of the present invention;
FIG. 8 is another flowchart of a data sending method according to
an embodiment of the present invention;
FIG. 9 is another flowchart of a data receiving method according to
an embodiment of the present invention;
FIG. 10 shows a mapping pattern of first eMBB data on a
time-frequency resource block according to an embodiment of the
present invention;
FIG. 11 is a block structural diagram of a data sending apparatus
according to an embodiment of the present invention;
FIG. 12 is a block structural diagram of a data receiving apparatus
according to an embodiment of the present invention;
FIG. 13 is a block structural diagram of a network device according
to an embodiment of the present invention; and
FIG. 14 is a block structural diagram of user equipment according
to an embodiment of the present invention.
DESCRIPTION OF EMBODIMENTS
FIG. 2a is a network structural diagram of a communications system
according to an embodiment of the present invention. The
communications system includes a base station and user equipment.
The communications system may be a global system for mobile
communications (GSM), a code division multiple access (CDMA)
system, a wideband code division multiple access (WCDMA) system, a
worldwide interoperability for microwave access (WiMAX) system, a
long term evolution (LTE) system, a 5G communications system (for
example, a new radio (NR) system, a communications system that
integrates multiple communications technologies (for example, a
communications system integrating an LTE technology and an NR
technology)), or a subsequently evolved communications system.
The base station communicates with the user equipment by using a
wireless air interface. The base station may be a BTS (Base
Transceiver Station) in a GSM system or a CDMA system or may be an
NB (Node B) in a WCDMA system or may be an eNB (evolutional Node B)
in an LTE system or even may be a base station in a 5G system and a
base station in a future communications system. The base station is
mainly responsible for functions such as radio resource management,
quality of service management (QoS), and data compression and
encryption on an air interface side. On a core network side, the
base station is mainly responsible for forwarding control plane
signaling and user plane service data to a core network.
The user equipment is a device connected to a network side by using
the base station. The user equipment includes, but is not limited
to, a cellular phone, a cordless phone, a session initiation
protocol (SessiSIP) phone, a wireless local loop (WLL) station, a
personal digital assistant (PDA), a handheld device having a
wireless communication function, a computing device or another
processing device connected to a wireless modem, an in-vehicle
device, a wearable device, and a terminal device in a future 5G
network.
FIG. 2b is a diagram of a working procedure of a communications
system according to an embodiment of the present invention. In this
embodiment of the present invention, the working procedure includes
the following operations.
Operation S201: Receive a transport block.
The transport block (TB) may carry any service type. For example,
the transport block is a transport block of an eMBB service or a
transport block of a URLLC service. In a slot n, the base station
receives, on a physical layer, a transport block sent by a MAC
layer. The transport block is a bit sequence. A length of the
transport block is not limited in this embodiment. Transport blocks
of different service types have different lengths. It should be
noted that the base station may process a plurality of transport
blocks. Each transport block has the same processing procedure on
the physical layer. A processing procedure of one transport block
on the physical layer is described below.
Operation S202: Add a CRC code.
The base station may calculate a CRC code of the transport block
according to a preset CRC algorithm. The calculated CRC code is a
binary sequence having a specified length. The base station adds
the calculated CRC code after the TB to generate a check bit
sequence. In this embodiment of the present invention, the CRC
algorithm includes, but is not limited to, any one of a CRC-8,
CRC-12, CRC-16, and CRC-32.
Operation S203: Segmentation.
Segmentation is an optional operation. The base station determines
whether a length of the check bit sequence generated in S202 is
greater than a preset length threshold (for example, 6144 bits).
The length threshold is a maximum length of bits that a coder can
process in S204. If it is determined that the length is greater
than the length threshold, the base station segments the transport
block in S201 into a plurality of subblocks, and a respective
corresponding CRC code is added after each subblock to obtain a
code block (CB). It needs to be ensured that a length of each code
block is less than the length threshold. If it is determined that
the length is not greater than the length threshold, a segmentation
processing operation is not performed. It should be noted that if
segmentation is required, a processing procedure of each code block
includes operations S204 to S209. A process of operations S204 to
S209 is described below by using an example in which segmentation
is not required.
Operation S204: Channel coding.
Channel coding is to provide transmission of information bits with
error detection and correction capabilities. A channel coding
algorithm includes, but is not limited to, Turbo code, polar code,
and LDPC (Low Density Parity Check Code). The base station performs
channel coding on the check bit sequence or the code blocks to
which the CRC codes are added to obtain a channel coding
sequence.
Operation S205: Rate matching.
Rate matching is used to match an amount of data to be transmitted
with a quantity of transmission resources. For example, in
operation S204, a Turbo coder is used to perform channel coding.
The Turbo coder performs channel coding on an input bit stream to
output in parallel three bit streams. The three bit streams are a
system bit stream, a first check bit stream, and a second check bit
stream. The three bit streams are simultaneously input into a
row-column interleaver and then stored in a circular buffer. The
system bit stream is located at the head of the circular buffer.
The first check bit stream and the second check bit stream are
sequentially arranged after the system bit stream. A bit selector
selects a starting point in the circular buffer, and sequentially
selects, from the starting point, a row of data having a specified
length as the input bit stream. There are a total of four starting
point candidate locations. The input bit streams corresponding to
the four locations are referred to as four redundancy versions
(RV). In this embodiment, output bit streams of the four redundancy
versions are referred to as redundancy version sequences.
Operation S206: Scrambling.
The base station performs a modulo 2 operation on a scrambled code
sequence and the redundancy version sequence obtained in operation
S205 to obtain a scrambled sequence. An effect of scrambling
processing is to randomize interference.
Operation S207: Modulation.
The modulation is used to load the scrambled sequence onto a
carrier. A modulation method includes, but is not limited to, any
one of QAM, AP SK, ASK, and QPSK, etc. A modulation order may be
set as required, and is not limited in this embodiment. The base
station performs modulation on the scrambled sequence to obtain a
modulated symbol sequence.
Operation S208: Resource mapping.
The resource mapping indicates mapping of a modulated symbol in a
modulated symbol sequence to a time-frequency resource block
corresponding to the slot n on a corresponding antenna port. A rule
of resource mapping may be specified in advance according to a
protocol of the communications system. The rule of resource mapping
may be related to a Cell ID, a subframe number, and a scheduling
policy of the base station.
Operation S209: IFFT.
The base station converts each subcarrier of a symbol mapped to
each symbol period into an OFDM symbol by using IFFT. The base
station then performs up-conversion on the OFDM symbol to obtain a
radio frequency signal, and sends the radio frequency signal to the
user equipment by using a wireless air interface.
Operation S210: Receive the OFDM symbol.
The user equipment processes data in each subframe on the physical
layer by using the same procedure. The user equipment first
receives control information in a control channel, and then obtains
data information in a data channel by using the control
information. The user equipment receives, in the slot n, the OFDM
symbol sent by the base station.
Operation S211: FFT.
The user equipment performs FFT processing on the received OFDM
symbol, converts the OFDM symbol into a modulated symbol, and
searches, a time-frequency resource block corresponding to the slot
n based on time-frequency resource locations indicated by the base
station, modulated symbols to be sent to the user equipment. The
modulated symbols to be sent to the user equipment are referred to
as a modulated symbol sequence in this embodiment.
Operation S212: Demodulation.
The user equipment performs demodulation processing on the
modulated symbol sequence obtained after FFT processing to obtain a
scrambled sequence.
Operation S213: Descrambling.
The user equipment performs an modulo 2 addition operation on the
scrambled sequence by using a preset scrambled code sequence to
obtain a redundancy version sequence of a redundancy version.
Operation S214: Rate de-matching.
The user equipment performs rate de-matching on the redundancy
version sequence obtained in S213 to obtain a channel coding
sequence.
Operation S215: Channel decoding.
If segmentation processing is performed on the transport block on a
base station side, the user equipment performs channel decoding on
each code block. The user equipment performs channel decoding to
obtain a check bit sequence.
Operation S216: CRC.
The user equipment determines a CRC code in the check bit sequence
and an information bit sequence, calculates a CRC code by using the
same CRC algorithm in S202, and performs comparison to determine
whether the calculated CRC code is the same as the CRC code in the
check bit sequence. If the calculated CRC code is the same as the
CRC code, it indicates that the check succeeds, and the user
equipment sends an ACK to the base station in a slot n+t1. If the
calculated CRC code is not the same as the CRC code, it indicates
that the check fails, and the user equipment sends a NACK to the
base station in the slot n+t1. It should be noted that if the TB is
segmented on the base station side, the user equipment needs to
check each CB and then checks the entire TB. If the check of each
CB and the check of the entire TB succeed, it indicates that the
check succeeds. If the check of each CB fails, the check of the
entire TB fails or both the check of each CB and the check of the
entire TB fail, the check fails.
If the base station receives, in the slot n+t1, the ACK sent by the
user equipment, it is determined that the transport block is
successfully transmitted, and a HARQ process of the transport block
is released. If the base station receives, in the slot n+t1, the
NACK sent by the user, it is determined that the transport block is
not transmitted successfully. The base station retransmits another
redundancy version to the user equipment in a slot n+t1+t2. As may
be learned, a problem that exists in the foregoing data
retransmission method is as follows: The base station needs to
receive the NACK returned by the user equipment before performing
retransmission. Generally, it is necessary to wait a time length of
eight slots before retransmission is performed, resulting in high
latency of retransmission. In addition, the base station needs to
retransmit the entire transport block when receiving the NACK fed
back by the user. As a result, an amount of data to be
retransmitted is large, and a large quantity of transmission
resources are occupied.
FIG. 3 is a flowchart of a data sending method according to an
embodiment of the present invention. In this embodiment of the
present invention, the method includes, but is not limited to, the
following operations.
Operation S301: Within a first scheduling period, if first type
data is punctured by second type data, preserve a first data
subset, preempted by the second type data, in the first type data
and puncture location information of the first data subset in the
first type data.
The first scheduling period may be on a per-slot or subframe basis.
A length of the first scheduling period may be at least one slot or
at least one subframe. A length of the slot and subframe is not
limited in this embodiment. The first type data and the second type
data are data of two different service types. A priority of the
second type data is higher than that of the first type data. For
example, the first type data is eMBB data, and the second type data
is URLLC data. Time-frequency resources corresponding to a
scheduling period are a time-frequency resource block. The
time-frequency resource block is a plurality of OFDM symbols in an
entire time domain. Duration of the plurality of OFDM symbols is
equal to the scheduling period. The time-frequency resource block
is a plurality of subcarriers in an entire frequency domain. One
OFDM symbol and one subcarrier are an RE (Resource Element) of the
time-frequency resource block. A time-frequency resource block
corresponding to the first scheduling period is a first
time-frequency resource block. Before the first type data is
punctured by the second type data, a network device has allocated
time-frequency resources in the first time-frequency resource block
to the first type data. The network device may be a base station.
When receiving the second type data within the first scheduling
period, the network device punctures the time-frequency resources
of the first type data. Locations at which the network device
punctures the time-frequency resources of the first type data are
not limited in this embodiment. Puncturing indicates that the
network device allocates, to the second type data instead,
time-frequency resources that are originally allocated to the first
data subset in the time-frequency resources of the first type data.
Therefore, the network device can know locations of REs of the
first data subset in the first type data that are punctured. The
network device determines the punctured first data subset and the
puncture location information of the first data subset in the first
type data based on the locations of the punctured REs. The network
device preserves the first data subset and the puncture location
information. Because the first type data is punctured by the second
type data, the network device can only send, to user equipment
within the first scheduling period, the second type data and a
second data subset that is not punctured by the second type data
and that is in the first type data.
Operation S302: Transmit the first data subset, the puncture
location information, and puncture indication information within a
second scheduling period.
Specifically, the second scheduling period may be on a per-slot or
subframe basis. Duration of the second scheduling period is at
least one slot or at least one subframe. A length of the slot and
subframe is not limited in this embodiment. The first scheduling
period and the second scheduling period may belong to two adjacent
scheduling operations or may belong to two nonadjacent scheduling
operations. For example, the first scheduling period is a slot n,
and the second scheduling period is a slot n+1. For another
example, the first scheduling period is a slot n, and the second
scheduling period is a slot n+3. A time-frequency resource block
corresponding to the second scheduling period is a second
time-frequency resource block. The network device transmits the
first data subset, the puncture location information, and the
puncture indication information within the second scheduling
period. The puncture location information indicates a location of
the first data subset in the first type data. The puncture
indication information indicates that the first data subset is
retransmitted data triggered by puncturing. The puncture location
information and the puncture indication information are carried in
DCI delivered by the network device within the second scheduling
period or may be carried in other information delivered by the
network device within the second scheduling period. This is not
limited in this embodiment.
During implementation of the foregoing embodiment, within the first
scheduling period, if the first type data to be sent is punctured
by the second type data, the network device preserves the first
data subset, punctured by the second type data, in the first type
data and the puncture location information of the first data subset
in the first type data, and sends the first data subset, the
puncture location information, and the puncture indication
information to the user equipment within the second scheduling
period. The network device does not need to wait for feedback from
the user equipment before the network device can perform a
retransmission operation, so that latency of a retransmission
operation is reduced. In addition, the network device does not need
to retransmit the entire first type data during retransmission, and
only needs to retransmit the punctured first data subset, so that
an amount of data to be retransmitted is reduced and the
retransmission operation occupies fewer time-frequency
resources.
FIG. 4 is a flowchart of a data receiving method according to an
embodiment of the present invention. In this embodiment of the
present invention, the method includes the following
operations.
Operation S401: Receive and preserve a second data subset within a
first scheduling period.
The first scheduling period may be on a per-slot or subframe basis.
A length of the slot or subframe is not limited in this embodiment.
The first scheduling period includes at least one slot or at least
one subframe. A length of the first scheduling period is not
limited in this embodiment. Time-frequency resources corresponding
to the first scheduling period are a first time-frequency resource
block. User equipment obtains the second data subset at specified
locations in the first time-frequency resource block based on
control information of a network device, and preserves the second
data subset, where the second data subset is a part of first type
data to be sent in the network device, and the second data subset
is data that is not punctured by second type data and that is in
the first type data.
Operation S402: Receive a first data subset, puncture location
information, and puncture indication information within a second
scheduling period.
The second scheduling period may be on a per-slot or subframe
basis. A length of the slot or subframe is not limited in this
embodiment. The second scheduling period includes at least one slot
or at least one subframe. The first scheduling period and the
second scheduling period may belong to two adjacent scheduling
operations or may belong to two nonadjacent scheduling operations.
For example, the first scheduling period is a slot n, and the
second scheduling period is a slot n+1. For another example, the
first scheduling period is a slot n, and the second scheduling
period is a slot n+2. Time-frequency resources corresponding to the
second scheduling period are a second time-frequency resource
block. The user equipment may parse the second time-frequency
resource block based on an indication of the network device to
obtain the first data subset, the puncture location information,
and the puncture indication information. The puncture location
information and the puncture indication information may be in DCI
of a physical downlink control channel of the second time-frequency
resource block. The user equipment determines a location of the
first data subset in the first type data based on the puncture
location information. In this way, a location relationship between
the first data subset and the second data subset may be
determined.
Operation S403: Combine the first data subset and the second data
subset based on the puncture location information to obtain the
first type data.
Specifically, the user equipment determines the location
relationship between the first data subset and the second data
subset based on the puncture location information, and the user
equipment combines the first data subset and the second data subset
to obtain the first type data.
During implementation of the foregoing embodiment, the user
equipment receives and preserves the second data subset within the
first scheduling period, the user equipment receives the first data
subset, the puncture location information, and the puncture
indication information within the second scheduling period, the
user equipment learns, based on the puncture indication
information, that the first data subset is retransmitted data
triggered by puncturing, and the user equipment combines the first
data subset and the second data subset based on the puncture
location information to obtain the first type data. In this way,
the network device does not need to wait for feedback from the user
equipment before the network device can retransmit data to the user
equipment, so that latency of a retransmission operation is
reduced. In addition, the user equipment does not need to receive
the entire eMBB data during the retransmission operation, and only
needs to receive data that is a part of first type data, so that an
amount of data of the retransmission operation is reduced and fewer
time-frequency resources are occupied.
Referring to FIG. 5, first type data is original eMBB data, second
service type data is URLLC data, a first data subset is first eMBB
data, and a second data subset is second eMBB data. An eMBB data
sending method in an embodiment of the present invention is
described below in detail by using an example in which the first
eMBB data, the second eMBB data, and the original eMBB data are
scrambled sequences obtained after scrambling processing. In this
embodiment, the method includes the following operations.
Operation S501: Receive a transport block of an eMBB service. A
base station receives the transport block of the eMBB service in a
slot n.
Operation S502: Add a CRC code.
Operation S503: Segmentation.
Operation S504: Channel coding.
Operation S505: Rate matching.
Operation S506: Scrambling.
An implementation process of operations S501 to S506 is the same as
that of S201 to S206 in FIG. 2b. For a specific process, refer to
description of S201 to S206. Details are not described herein
again. It should be noted that a scrambled sequence of the eMBB
service generated by the base station after scrambling processing
is referred to as the original eMBB data.
Operation S507: Modulation.
The base station performs modulation on the original eMBB data to
generate a modulated symbol sequence. A specific modulation method
is not limited in this embodiment.
Operation S508: Resource mapping.
A time-frequency resource block corresponding to the slot n is a
first time-frequency resource block. The base station maps a
modulated symbol sequence of the eMBB service to REs of the first
time-frequency resource block. A mapping method is not limited in
this embodiment.
For example, referring to FIG. 1a, the first time-frequency
resource block corresponds to seven OFDM symbols in a time domain
and corresponds to 12 subcarriers in a frequency domain. The first
time-frequency resource block includes 84 REs. The base station
maps the modulated symbol sequence of the eMBB service to the third
column to the seventh column of REs in the first time-frequency
resource block. Each modulated symbol is mapped to one RE. A total
of 60 REs are allocated to the modulated symbols of the eMBB
service. The first column and the second column of REs in the first
time-frequency resource block are allocated to a control
channel.
Operation S509: Receive a transport block of a URLLC service.
In the slot n, a physical layer of the base station receives a new
transport block of the URLLC service. It should be noted that the
operation in which the base station receives the transport block of
the URLLC service may be performed before or after any operation of
S501 to S508. This is not limited in this embodiment.
Operation S510: Add a CRC code.
Operation S511: Segmentation.
Operation S512: Channel coding.
Operation S513: Rate matching.
Operation S514: Scrambling.
An implementation process of operations S509 to S514 is the same as
that of operations S201 to S206 in FIG. 2b. For a specific
implementation process, refer to description of S201 to S206.
Details are not described herein again. It should be noted that the
base station performs scrambling processing to generate a scrambled
bit sequence of the URLLC service. The scrambled bit sequence of
the URLLC service is referred to as URLLC data in this
embodiment.
Operation S515: Modulation.
The base station modulates the URLLC data to generate a modulated
symbol sequence of the URLLC service. A modulation method is not
limited in this embodiment.
Operation S516: Puncturing.
The base station performs puncturing in a time-frequency resource
block of the original eMBB data in the first time-frequency
resource block. Puncturing indicates that URLLC data preempts
time-frequency resources in the time-frequency resource block of
the original eMBB data, and time-frequency resources used to map
the first eMBB data in the time-frequency resource block of the
original eMBB data are allocated to the URLLC data.
For example, referring to FIG. 1b, if the third column to the
seventh column of REs in the first time-frequency resource block
have been allocated to the original eMBB data, the base station
punctures the third column to the seventh column of REs. Assuming
that puncture locations selected by the base station in the first
time-frequency resource block are the fourth column of REs, the
base station allocates the fourth column of REs in the first
time-frequency resource block to the URLLC data. In this
embodiment, because the original eMBB data, the first eMBB data and
the second eMBB data are bit sequences obtained after scrambling
processing, the base station first determines punctured REs in the
first time-frequency resource block. The base station determines a
punctured modulated symbol sequence of the eMBB service based on a
correspondence between an RE and a modulated symbol, and then
determines a scrambled bit sequence (that is, the first eMBB data)
corresponding to the punctured modulated symbol sequence of the
eMBB service based on a correspondence between a modulated symbol
and a scramble bit. The base station preserves the first eMBB data
and puncture location information. In this embodiment, the puncture
location information may be indicated by using a starting location
and a length of the first eMBB data in the original eMBB data. The
first eMBB data may be one continuous sequence in the original eMBB
data. Alternatively, the first eMBB data is a plurality of
continuous sequences in the original eMBB data. This is not limited
in this embodiment.
Referring to FIG. 7a, data in the first row in FIG. 7a is
unpunctured original eMBB data. Data in the second row is URLLC
data received in the slot n. The base station determines, based on
a puncture pattern in the first time-frequency resource block, that
puncture locations of the URLLC data in the original eMBB data are
bits between dotted lines. The first eMBB data is the sixth bit to
the fifteenth bit in the original eMBB data. The base station
determines that the first eMBB data is one continuous sequence. The
base station uses the starting location and the length of the first
eMBB data to indicate the puncture location information. The
starting location of the first eMBB data in this embodiment is 6,
and the length of the first eMBB data is 10. A part that is not
punctured by the URLLC data in the original eMBB data is the second
eMBB data. Data in the fourth row in FIG. 7a is a diagram of
distribution of the URLLC data and the second eMBB data obtained
after the original eMBB data is punctured.
Referring to FIG. 7b, the first eMBB data is two continuous
sequences, and the base station uses a starting location of each
sequence and a length of each sequence to indicate the puncture
location information. In this embodiment, a starting location of a
first sequence in the first eMBB is 6, and a length of the first
sequence is 10; and a starting location of a second sequence is 22,
and a length of the second sequence is 4. Data in the fourth row in
FIG. 7b is a diagram of distribution of URLLC data obtained after
the original eMBB data is punctured and the second eMBB data.
Operation S517: IFFT.
The base station obtains a first OFDM symbol based on the URLLC
data and the second eMBB data, and performs up-conversion on the
first OFDM symbol to generate a radio frequency signal, and the
base station sends the radio frequency signal to user
equipment.
Operation S518: Store the first eMBB data and the puncture location
information.
The base station may construct a binary sequence A. The binary
sequence A is used to indicate the first eMBB data and the puncture
location information. As shown in FIG. 7a, the first eMBB data is
one continuous sequence. The first eMBB data and the puncture
location information stored in the base station are represented as
A={d1 d2 d3 d4 d5 d6 d7 d8 d9 d10, 000000110, 00001010}, where d1
to d9 represent bits of the first eMBB data, 00000110 represents
that the starting location of the first eMBB data is a sixth bit in
the original eMBB data, and 00001010 represents that the length of
the first eMBB data is 10.
As shown in FIG. 7b, the first eMBB data is two continuous
sequences. Binary information of the first eMBB data and the
puncture location information stored in the base station is
represented as A={d1 d2 d3 d4 d5 d6 d7 d8 d9 d10, 000000110,
00001010; e1 e2 e3 e4, 00010110, 00000100}, where d1 to d9
represent bits of the first sequence, 00000110 represents that the
starting location of the first sequence is the sixth bit in the
original eMBB data, and 00001010 represents that the length of the
first sequence is 10; and e1 to e4 represent bits of the second
sequence, 00010110 represents that the starting location of the
second sequence is the twenty-second bit in the original eMBB data,
and 00000100 represents that the length of the second sequence is
4. It should be noted that a length of bits used to represent a
starting location and a length is not limited to the eight bits in
this embodiment. A specific quantity of bits may be set as
required.
Optionally, the first eMBB data and the puncture location
information are not limited to the foregoing method and may be
separately stored. The puncture location information is carried in
DCI or a MAC-CE of a downlink control channel.
Operation S519: Obtain the first eMBB data.
In a slot n+t, the base station obtains the first eMBB data and the
puncture location information that are preserved in advance, where
t is an integer greater than 0.
Operation S520: Add a CRC code.
The addition of a CRC code is an optional operation that adds a CRC
code to the first eMBB data to add data error detection and
correction capabilities.
Operation S521: Segmentation.
Operation S522: Channel coding.
Channel coding is an optional operation. Channel coding is used to
improve anti-interference capability of data.
Operation S523: Rate matching.
Operation S524: Scrambling.
Operation S525: Modulation.
Operation S526: Resource mapping.
Operation S527: IFFT.
The base station performs IFFT processing to obtain a second OFDM
symbol, performs up-conversion processing on the second OFDM symbol
to obtain a radio frequency signal, and sends the radio frequency
signal to the user equipment. It should be noted that a user
further needs to send puncture indication information to the user
equipment in the slot n+t. The puncture indication information may
be carried in DCI of a physical downlink control channel or carried
in a MAC-CE or carried in another message in the slot n+t. This is
not limited in this embodiment. The puncture indication information
indicates that the first eMBB data is retransmitted data triggered
by puncturing.
For an implementation process of operations S521 and S527, refer to
description of S202 to S207 in FIG. 2b. The base station adds CRC
code processing and channel coding processing to the first eMBB
data, thereby improving reliability of transmitting the first eMBB
data.
During implementation of the foregoing embodiment, in the slot n,
if an original scrambled sequence is to be sent, the base station
preserves a punctured scrambled sequence in the original eMBB data
and the puncture location information of the punctured scrambled
sequence in the original scrambled sequence, and sends the
punctured scrambled sequence, the puncture location information,
and the puncture indication information to the user equipment in
the slot n+t. The base station does not need to wait for feedback
from the user equipment before the base station performs a
retransmission operation, so that latency of a retransmission
operation is reduced. In addition, the base station does not need
to retransmit the entire original scrambled sequence during
retransmission, and only needs to retransmit the punctured
scrambled sequence, so that an amount of data to be retransmitted
is reduced and the retransmission operation occupies fewer
time-frequency resources.
Correspondingly, FIG. 6 shows a process of receiving eMBB data by
the user equipment corresponding to the eMBB data generated as in
FIG. 5. In this embodiment of the present invention, the process of
receiving eMBB data includes, but is not limited to, the following
operations.
Operation S601: Receive the first OFDM symbol.
The user equipment receives, in the slot n, the first OFDM symbol
sent by the base station. For a process of generating the first
OFDM symbol, refer to FIG. 5.
Operation S602: FFT.
Operation S603: Demodulation.
Demodulation processing is performed to generate the scrambled
sequence. The scrambled sequence herein is the second eMBB
data.
Operation S604: Descrambling.
Operation S605: Rate de-matching.
Operation S606: Channel decoding.
An implementation process of operations S601 to S606 is the same as
that of operations S210 to S215 in FIG. 2b. For a specific process,
refer to description of operations S210 to S215. Details are not
described herein again.
Operation S607: CRC.
Channel decoding is performed to obtain a check bit sequence. The
check bit sequence includes information bits and a CRC code. The
CRC code is a bit sequence corresponding to the original eMBB data.
The information bits herein are a bit sequence corresponding to the
second eMBB data. The CRC code calculated based on the current
information bits is different from the CRC code carried in the
check bit sequence, and a result of CRC in operation S607 is a
failure.
Operation S608: Preserve the second eMBB data.
The user equipment may preserve the scrambled sequence after
generating the scrambled sequence in operation S603. The scrambled
sequence in this case is the second eMBB data. It should be noted
that if a check result of CRC in operation S607 is a success, the
user equipment deletes the preserved second eMBB data.
Operation S609: Receive the second OFDM symbol.
The base station receives the second OFDM symbol in the slot n+t.
For a process of generating the second OFDM symbol, refer to the
process shown in FIG. 5.
Operation S610: FFT.
Operation S611: Demodulation.
Operation S612: Descrambling.
Operation S613: Rate de-matching.
Operation S614: Channel decoding.
Operation S615: Remove the CRC code.
The first eMBB data is obtained after the CRC code is removed.
Operation S616: Data combination.
The puncture location information and the puncture indication
information that are sent by the base station are obtained in the
slot n+t. If determining, based on the puncture indication
information, that the first eMBB data is retransmitted data
triggered by puncturing, the user equipment obtains a HARQ process
number transmitted in the slot n+t. The HARQ process number may be
carried in DCI transmitted in the slot n+t. The base station
determines, based on the HARQ process number obtained in the slot
n+t, that an initial transmission operation is in the slot n. The
slot n and the slot n+t have a same HARQ process number. The user
equipment obtains the second eMBB data preserved in the slot n, and
combines the first eMBB data and the second eMBB data based on the
puncture location information to obtain the original eMBB data. The
original eMBB data is the scrambled sequence.
Operation S617: Descrambling.
Operation The base station performs descrambling processing on the
scrambled sequence to obtain a redundancy version sequence.
Operation S618: Rate de-matching.
Operation S619: Channel decoding.
Operation S620: CRC check.
It should be noted that for an implementation process of operations
S617 to S620, refer to operations S213 to S216 in FIG. 2b. Details
are not described herein again.
During the implementation of the foregoing embodiment, the user
equipment receives and preserves, in the slot n, scrambled
sequences that are not punctured in original scrambled sequences,
the user equipment receives punctured scrambled sequences, the
puncture location information, and the puncture indication
information in the slot n+t, the user equipment learns, based on
the puncture indication information, that the data received in the
slot n+t is retransmitted data triggered by puncturing, and the
user equipment combines the punctured scrambled sequences and the
unpunctured scrambled sequences based on the puncture location
information to obtain the original scrambled sequences. In this
way, the base station does not need to wait for feedback from the
user equipment before the base station can retransmit data to the
user equipment, so that latency of a retransmission operation is
reduced. In addition, the user equipment does not need to receive
the entire original scrambled sequence during a retransmission
operation, and only needs to receive data that is a part of the
original scrambled sequence, so that an amount of data of the
retransmission operation is reduced and fewer time-frequency
resources are occupied.
Referring to FIG. 8, first type data is original eMBB data, second
service type data is URLLC data, a first data subset is first eMBB
data, and a second data subset is the second eMBB data. An eMBB
data sending method in an embodiment of the present invention is
described below by using an example in which the first eMBB data,
the second eMBB data, and the original eMBB data are modulated
symbols.
Operation S801: Receive a transport block of an eMBB service.
Operation S802: Add a CRC code.
Operation S803: Segmentation.
Operation S804: Channel coding.
Operation S805: Rate matching.
Operation S806: Scrambling.
Operation S807: Modulation.
For an implementation process of operations S801 to S807, refer to
description of operations S201 to S207 in FIG. 2b. Modulation
processing is performed to generate a modulated symbol sequence.
The modulated symbol sequence herein is referred to as the original
eMBB data.
Operation S808: Resource mapping.
A time-frequency resource block corresponding to a slot n is a
first time-frequency resource block. A base station maps the
original eMBB data to REs of the first time-frequency resource
block. A mapping method is not limited in this embodiment.
For example, referring to FIG. 1a, the first time-frequency
resource block corresponds to seven OFDM symbols in a slot and
corresponds to 12 subcarriers in a frequency domain. The base
station maps the original eMBB data to the third column to the
seventh column of REs in the first time-frequency resource block.
Each modulated symbol in the original eMBB data is mapped to one
RE. A total of 60 REs are allocated to the original eMBB data. The
first column and the second column of REs in the first
time-frequency resource block are allocated for use by a control
channel.
Operation S809: Receive a transport block of a URLLC service.
In the slot n, a physical layer of the base station receives a new
transport block of the URLLC service. It should be noted that the
operation in which the base station receives the transport block of
the URLLC service may be performed before or after any operation of
S801 to S808. This is not limited in this embodiment.
Operation S810: Add the CRC code.
Operation S811: Segmentation.
Operation S812: Channel coding.
Operation S813: Rate matching.
Operation S814: Scrambling.
Operation S815: Modulation.
An implementation process of operations S810 to S815 is the same as
that of operations S201 to S206 in FIG. 2b. For a specific
implementation process, refer to description of operations S201 to
S206. It should be noted that the base station performs modulation
processing to generate the modulated symbol sequence of the URLLC
service. The modulated symbol sequence of the URLLC service is
referred to as URLLC data in this embodiment.
Operation S816: Puncturing.
The base station performs puncturing in a time-frequency resource
block of the original eMBB data in the first time-frequency
resource block. Puncturing indicates that URLLC data preempts
time-frequency resources in the time-frequency resource block of
the original eMBB data, and time-frequency resources used to map
the first eMBB data in the time-frequency resource block of the
original eMBB data are allocated to the URLLC data.
For example, referring to FIG. 1b, if the base station receives
URLLC data in the slot n, the base station determines that
time-frequency resources to which the original eMBB data is mapped
in the first time-frequency resource block are the third column to
the seventh column of REs. The base station punctures the third
column to the seventh column of REs. Assuming that puncture
locations are the fourth column of REs, the base station allocates
the fourth column of REs to the URLLC data. The base station
determines punctured REs in the first time-frequency resource
block, and determines, based on mapping relationship between an RE
and a modulated symbol, the first eMBB data that is punctured for
the URLLC data in the original eMBB data.
Operation S817: IFFT.
The base station sends a first OFDM symbol. The first OFDM symbol
is generated by using the URLLC data and the second eMBB data.
Operation S818: Store the first eMBB data and puncture location
information.
In one embodiment, the first eMBB data is modulated symbols. The
puncture location information indicates a first mapping pattern of
the first eMBB data in a time-frequency resource block
corresponding to a first scheduling period. For example, the base
station stores the first mapping pattern of the first eMBB data in
the time-frequency resource block in FIG. 1b.
Operation S819: Resource mapping.
A time-frequency resource block corresponding to a slot n+t is a
second time-frequency resource block. The base station maps the
first eMBB data to the second time-frequency resource block. The
base station may perform resource mapping according to a rule of
performing mapping in a time domain before a frequency domain.
Mapping locations in the second time-frequency resource block by
the base station are not limited in this embodiment.
For example, referring to FIG. 10, mapping locations of the first
eMBB data in the time-frequency resource block corresponding to the
slot n+t are REs in the third column to the seventh column and the
fifth row to the seventh row.
It should be noted that if the first mapping pattern of the first
eMBB data in the time-frequency resource block corresponding to the
slot n is the same as a second mapping pattern of the first eMBB
data in the time-frequency resource block corresponding to the slot
n+t, the puncture location information of which the base station
notifies user equipment in the slot n+t may be the first mapping
pattern or the second mapping pattern.
In addition, the puncture location information may further indicate
a conversion rule of the first eMBB data in a time-frequency
resource block corresponding to a second scheduling period, where
the conversion rule indicates a correspondence between the first
mapping pattern and the second mapping pattern of the first eMBB
data in the time-frequency resource block corresponding to the
second scheduling period.
For example, the conversion rule indicates a correspondence between
the first mapping pattern in FIG. 1b and the second mapping pattern
in FIG. 10.
Operation S820: IFFT.
The base station performs IFFT on the first eMBB data to obtain a
second OFDM symbol, performs up-conversion on the second OFDM
symbol to obtain a radio frequency signal, and sends the radio
frequency signal to the user equipment.
During implementation of the foregoing embodiment, in the slot n,
if an original modulated symbol sequence is to be sent, the base
station preserves a punctured modulated symbol sequence in the
original eMBB data and puncture location information of the
punctured modulated symbol sequence in the original modulated
symbol sequences, and sends the punctured modulated symbol
sequence, the puncture location information, and puncture
indication information to the user equipment in the slot n+t. The
base station does not need to wait for feedback from the user
equipment before the base station performs a retransmission
operation, so that latency of a retransmission operation is
reduced. In addition, the base station does not need to retransmit
the entire original modulated symbol sequence during
retransmission, and only needs to retransmit the punctured
modulated symbol sequence, so that an amount of data to be
retransmitted is reduced and retransmission operation occupies
fewer time-frequency resources.
FIG. 9 is a flowchart of receiving eMBB data by the user equipment
corresponding to the eMBB data generated in FIG. 8. In this
embodiment of the present invention, the method includes, but is
not limited to, the following operations.
Operation S901: Receive the first OFDM symbol.
The user equipment receives the first OFDM symbol in the slot n.
For a process of generating the first OFDM symbol, refer to
description in FIG. 8.
Operation S902: FFT.
Operation S903: Demodulation.
Operation S904: Descrambling.
Operation S905: Rate de-matching.
Operation S906: Channel decoding.
An implementation process of operations S901 to S906 is the same as
that of operations S210 to S215 in FIG. 2b. For a specific process,
refer to description of operations S210 to S215. Details are not
described herein again.
Operation S907: CRC.
Channel decoding is performed to obtain a check bit sequence. The
check bit sequence includes an information bit sequence and a check
code. The check code is generated from an information bit sequence
corresponding to the original eMBB data. The information bit
sequence herein is an information bit sequence corresponding to the
second eMBB data. Therefore, the CRC code calculated based on the
current information bit sequence is different from the CRC code
carried in the check bit sequence. A result of CRC in operation
S907 is a failure.
Operation S908: Store the second eMBB data.
The user equipment may store the second eMBB data after generating
the modulated symbol sequences. It should be noted that a result of
CRC in S907 is a success, and the user equipment deletes the stored
second eMBB data.
Operation S909: Receive the second OFDM symbol.
The user equipment receives the second OFDM symbol in the slot n+t.
For a process of generating the second OFDM symbol, refer to the
process shown in FIG. 8.
Operation S910: FFT.
The user equipment performs FFT to obtain the first eMBB data. The
first eMBB data is modulated symbol sequences.
Operation S911: Obtain the second eMBB data.
If receiving, in the slot n+t, the puncture indication information
sent by the base station, the user equipment determines that the
first eMBB data is retransmitted data triggered by puncturing, and
obtains the second eMBB data preserved in advance in the slot n. It
should be noted that the base station may determine, based on a
HARQ process number corresponding to the slot n+t, a slot n having
the same HARQ process number. The puncture indication information
may be carried in DCI or a MAC-CE of a physical downlink channel or
may be carried in another message of the slot n+t. This is not
limited in this embodiment.
In one embodiment, the puncture location information indicates the
first mapping pattern of the first eMBB data in the first
time-frequency resource block of the slot n.
In one embodiment, the puncture location information indicates a
conversion rule between the first mapping pattern and the second
mapping pattern. The second mapping pattern indicates mapping
locations of the first eMBB data in the second time-frequency
resource block of the slot n+t. The user equipment may obtain the
first mapping pattern of the first eMBB data in the first
time-frequency resource block of the slot n according to the
conversion rule and based on the second mapping pattern.
It should be noted that if the puncture location information
indicates the conversion rule, a demapping operation is further
included after 910. Demapping is used to obtain the first mapping
pattern based on the second mapping pattern and according to the
conversion rule.
The puncture location information may be carried in DCI or a MAC-CE
of the slot n+t or in another message. This is not limited in this
embodiment.
Operation S912: Data combination.
The user equipment receives, in the slot n+t, the puncture location
information sent by the base station, determines a location
relationship between the first eMBB data and the second eMBB data
based on the puncture location information, and combines the first
eMBB data and the second eMBB data to obtain the original eMBB
data.
Operation S913: Demodulation.
Operation S914: Descrambling.
Operation S915: Rate de-matching.
Operation S916: Channel decoding.
Operation S917: CRC.
For operations S913 to S917, refer to description of operations
S212 to S216 in FIG. 2b. Details are not described herein
again.
During implementation of the foregoing embodiment, the user
equipment receives and preserves, in the slot n, modulated symbol
sequences that are not punctured in the original modulated symbol
sequences, the user equipment receives, in the slot n+t, the
punctured modulated symbol sequences, the puncture location
information, and the puncture indication information, the user
equipment learns, based on the puncture indication information,
that data received in the slot n+t is retransmitted data triggered
by puncturing, and the user equipment combines the punctured
modulated symbol sequences and the unpunctured modulated symbol
sequences based on the puncture location information to obtain the
original modulated symbol sequences. In this way, the base station
does not need to wait for feedback from the user equipment before
the base station can retransmit data to the user equipment, so that
latency of a retransmission operation is reduced. In addition, the
user equipment does not need to receive all the original modulated
symbol sequences during a retransmission operation, and only needs
to receive data that is a part of the original modulated symbol
sequences. An amount of data of the retransmission operation is
reduced and fewer time-frequency resources are occupied.
It should be noted that a data sending apparatus 11 in FIG. 11 may
be implemented on a network device side in the embodiment shown in
FIG. 3. A preservation unit 1101 is configured to perform operation
S301. A transmission unit 1102 is configured to perform operation
S302. The data sending apparatus 11 may be a base station. The data
sending apparatus 11 may be alternatively an application-specific
integrated circuit (ASIC) or a digital signal processor (DSP) or a
chip that implements related functions.
It should be noted that a data receiving apparatus 12 in FIG. 12
may be implemented on a user equipment side in the embodiment shown
in FIG. 4. A preservation unit 1201 is configured to perform
operation S401. A receiving unit 1202 is configured to perform
operation S402. A combination unit 1203 is configured to perform
operation S403. The data receiving apparatus 12 may be user
equipment. The data receiving apparatus 12 may be alternatively a
field-programmable gate array (FPGA), an ASIC, a system on chip
(SoC), a central processing unit (CPU), a network processor (NP), a
DSP or a microcontroller unit (MCU) that implements related
functions, or may further use a programmable controller (e.g.,
programmable logic device, PLD) or another integrated chip.
As shown in FIG. 13, an embodiment of the present invention further
provides an apparatus 13.
When the apparatus 13 is a network device, for example, a base
station, the apparatus 13 includes a processor 1301, a transceiver
1302, and a memory 1303.
The memory 1303 is configured to store a program and data, where
the memory may be a random access memory (RAM) or a read-only
memory (ROM) or a flash memory. The memory 1303 may be separately
located in a communications device or may be located inside a
processor 1301. The memory 1303 is configured to preserve a first
data subset preempted by second type data in first type data and
puncture location information of the first data subset in the first
type data.
The transceiver 1302 may be used as a separate chip or may be a
transceiver circuit in the processor 1301 or may be used as an
input/output interface. The transceiver 1302 is configured to:
receive the first type data and the second type data within a first
scheduling period, and transmit the first data subset, the puncture
location information, and puncture indication information within a
second scheduling period, where the puncture indication information
is used to indicate that the first data subset is retransmitted
data triggered by puncturing.
The processor 1301 is configured to execute the program stored in
the memory. When the program is executed, the processor 1301 is
configured to: within the first scheduling period, if the first
type data is punctured by the second type data, instruct the memory
1302 to preserve the first data subset, occupied by the second type
data, in the first type data and the puncture location information
of the first data subset in the first type data. The transceiver
1303, the memory 1302, and the processor 1301 are optionally
connected by using a bus 3024.
When the network device 13 is a chip, the network device 13 may be
a FPGA, an ASIC, a SoC, a CPU, a NP, a DSP or a MCU, or may further
use PLD or another integrated chip that implements related
functions.
All or some of these chips may be implemented by using software,
hardware, firmware or any combination thereof. When a software
program is used to implement the embodiments, the embodiments may
be implemented completely or partially in a form of a computer
program product. The computer program product includes one or more
computer instructions. When the computer program instructions are
loaded and executed on a computer, the procedure or functions
according to the embodiments of this application are all or
partially generated. The computer may be a general-purpose
computer, a special-purpose computer, a computer network, or
another programmable apparatus. The computer instructions may be
stored in a computer-readable storage medium or may be transmitted
from a computer-readable storage medium to another
computer-readable storage medium. For example, the computer
instructions may be transmitted from a website, computer, server,
or data center to another website, computer, server, or data center
in a wired (for example, a coaxial cable, an optical fiber, or a
digital subscriber line (DSL)) or wireless (for example, infrared,
radio, and microwave, or the like) manner. The computer-readable
storage medium may be any usable medium accessible by a computer,
or a data storage device, such as a server or a data center,
integrating one or more usable media. The usable medium may be a
magnetic medium (for example, a floppy disk, a hard disk, or a
magnetic tape), an optical medium (for example, a DVD), a
semiconductor medium (for example, a solid-state drive (SSD)), or
the like.
As shown in FIG. 14, an embodiment of the present invention further
provides an apparatus 14.
When the apparatus 14 is user equipment, the apparatus 14 includes
a processor 1401, a memory 1402, and a transceiver 1403.
The transceiver 1403 may be used as a separate chip or may be a
transceiver circuit in a processor 1401 or may be used as an
input/output interface. The transceiver 1401 is configured to:
receive a second data subset within a first scheduling period; and
receive a first data subset, puncture location information, and
puncture indication information within a second scheduling period,
where the puncture indication information is used to indicate that
the first data subset is retransmitted data triggered by
puncturing, and the puncture location information indicates a
location of the first data subset in first type data.
The memory 1402 is configured to store a program and data, where
the memory may be a RAM or a ROM or a flash memory. The memory may
be separately located in a communications device or may be located
inside the processor 4042. The memory 1402 is configured to
preserve the second data subset within the first scheduling
period.
The processor 1401 is configured to execute the program stored in
the memory. The processor 1401 is configured to combine the first
data subset and the second data subset based on the puncture
location information to obtain the first type data.
The transceiver 1403, the memory 1402, and the processor 1401 are
optionally connected by using a bus.
When the apparatus 14 is a chip, the apparatus 14 may be a FPGA, an
ASIC, a SoC, a CPU, a NP, a DSP or a MCU that implements related
functions, or may further use a programmable controller (e.g., PLD)
or another integrated chip.
All or some of these chips may be implemented by using software,
hardware, firmware or any combination thereof. When a software
program is used to implement the embodiments, the embodiments may
be implemented completely or partially in a form of a computer
program product. The computer program product includes one or more
computer instructions. When the computer program instructions are
loaded and executed on a computer, the procedure or functions
according to the embodiments of this application are all or
partially generated. The computer may be a general-purpose
computer, a special-purpose computer, a computer network, or
another programmable apparatus. The computer instructions may be
stored in a computer-readable storage medium or may be transmitted
from a computer-readable storage medium to another
computer-readable storage medium. For example, the computer
instructions may be transmitted from a website, computer, server,
or data center to another website, computer, server, or data center
in a wired (for example, a coaxial cable, an optical fiber, or a
DSL) or wireless (for example, infrared, radio, and microwave, or
the like) manner. The computer-readable storage medium may be any
usable medium accessible by a computer, or a data storage device,
such as a server or a data center, integrating one or more usable
media. The usable medium may be a magnetic medium (for example, a
floppy disk, a hard disk, or a magnetic tape), an optical medium
(for example, a DVD), a semiconductor medium (for example, a SSD),
or the like.
An embodiment of the present invention further provides a
communications system, including the network device in the
foregoing network device embodiment and the user equipment.
A person of ordinary skill in the art may be aware that, in
combination with the examples described in the embodiments
disclosed in this specification, units and algorithm operations may
be implemented by electronic hardware or a combination of computer
software and electronic hardware. Whether the functions are
performed by hardware or software depends on particular
applications and design constraint conditions of the technical
solutions. A person skilled in the art may use different methods to
implement the described functions for each particular application,
but it should not be considered that the implementation goes beyond
the scope of the present invention.
It may be clearly understood by a person skilled in the art that,
for the purpose of convenient and brief description, for a detailed
working process of the foregoing system, apparatus, and unit, refer
to a corresponding process in the foregoing method embodiments, and
details are not described herein again.
For ease of brevity, each method embodiment may also be used as
mutual reference, and details are not described again. In the
several embodiments provided in this application, it should be
understood that the disclosed system, apparatus, and method may be
implemented in other manners. For example, the described apparatus
embodiments are merely examples. For example, the unit division is
merely logical function division and may be other division in
actual implementation. For example, a plurality of units or
components may be combined or integrated into another system, or
some features may be ignored or not performed. In addition, the
displayed or discussed mutual couplings or direct couplings or
communication connections may be implemented by some interfaces.
The indirect couplings or communication connections between the
apparatuses or units may be implemented in electronic, mechanical,
or other forms.
The units described as separate parts may or may not be physically
separate, and parts displayed as units may or may not be physical
units, may be located in one position, or may be distributed on a
plurality of network units. Some or all of the units may be
selected based on actual requirements to achieve the objectives of
the solutions of the embodiments.
In addition, functional units in the embodiments of the present
invention may be integrated into one processing unit, or each of
the units may exist alone physically, or two or more units are
integrated into one unit.
When the functions are implemented in the form of a software
functional unit and sold or used as an independent product, the
functions may be stored in a computer-readable storage medium.
Based on such an understanding, the technical solutions of the
present invention essentially, or the part contributing to the
prior art, or some of the technical solutions may be implemented in
a form of a software product. The computer software product is
stored in a storage medium, and includes several instructions for
instructing a computer device (which may be a personal computer, a
server, or a network device) to perform all or some of the
operations of the methods described in the embodiments of the
present invention. The foregoing storage medium includes: any
medium that can store program code, such as a USB flash drive, a
removable hard disk, a ROM, a RAM, a magnetic disk, or an optical
disc.
The foregoing descriptions are merely specific implementations of
the present invention, but are not intended to limit the protection
scope of the present invention. Any variation or replacement
readily figured out by a person skilled in the art within the
technical scope disclosed in the present invention shall fall
within the protection scope of the present invention. Therefore,
the protection scope of the present invention shall be subject to
the protection scope of the claims.
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